A perfect espresso espresso-Novell coffee how to make espresso? Mouth

Espresso, or espresso, is a type of coffee that is brewed with extremely hot, but not boiling, water by high pressure over ground coffee powder. "Espresso" is Italian for "accelerated speed." Italian coffee is known as the root of good coffee. Although the Italian coffee reputation belongs to Italy, and the first Italian coffee machine is in France to start a simple experiment, but as we know today, it is the Italians developed it.

Espresso is a technological method of brewing coffee, defined in the book Espresso Coffee The Chemistry of Quality, which must meet the following conditions:

Amount of coffee powder (1 cup) 6.5±1.58 g

Temperature of water (℃) 90°±5°

Water pressure 9±2 Atmospheric pressure (bar)

Filtration time 30±5 seconds

■ Water temperature: If the water temperature is too low, it will cause insufficient extraction, and the substances inside the coffee cannot be fully released, so that only a cup of Espresso with insufficient flavor and sour taste can be brewed; once the water temperature is too high, excessive extraction will make coffee bitter and astringent.

■ Water pressure: The general hot water brewing method can only extract water-soluble substances inside coffee, while Espresso can further extract water-soluble substances by high pressure. These high pressures will completely emulsify the lipid Substances inside the coffee and dissolve them in the water, which is the main source of the "body".

【P.S.】Emulsification will make the taste of Espresso more viscous, so that people drink up a "velvety soft" feeling; and viscosity will form a lower surface tension, more can invade the taste buds, so that the fragrance reverberates in the mouth, a long time does not disperse.

■ Filtration time: The length of filtration time will affect the amount of water, Espresso to extract the flavor of coffee with high pressure hot water, about 25 seconds to complete the task (after this period of time, the outflow of liquid has no taste, only diluted Espresso). Some people continue to let it run out of water after a timeout, filling a cup to form an Americano or Lungo, which tastes like charcoal coffee.